Can someone help me to solve this . An organic compound A has the following solu

Question

Can someone help me to solve this .

An organic compound A has the following solubility at room temperature: 12g A in 100 ml ether; 6g A in 100 ml H20 . Calculate which of the following extraction methods will yield the largest mass of A . Include masses of the compound yielded in both extractions.

Method 1). A solution of 6 g of A in 100 mL H20 is shaken with 100 ml ether(one extraction ).

Method 2). A solution of 6 g of A in 100 ml H20 is shaken with two 50 ml portions of ether (two extractions).

Explanation / Answer

Method 1

The solubility in ether is twice the solubility in water and both layers have same volume. Hence, out of 6 g of compound A, 4 g will be in ether layer and 2 g will be in water layer. Thus 4 g of compound A is extracted

Method 2

The solubility in ether is twice the solubility in water and volume of water is twice the volume of ether used for each extraction. Hence, after first extraction, ether layer will contain 3 g of compound A and water layer will contain 3 g of compound A.

Note: The amount of compound A in a layer is directly proportional to the product of its solubility (in g/L) and volume of the layer.

After second extraction, ether layer will contain 1.5 g compound A and water layer will contain 1.5 g compound A. Total compound A extracted in two extractions = 3+1.5 = 4.5 g

Hence, we will be able to extract more compound A in second method than in first method.

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.